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Re: runcon Invalid argument



On 04/13/2012 05:33 PM, Daniel J Walsh wrote:
On 04/13/2012 10:39 AM, Moray Henderson (ICT) wrote:
I'm trying to debug an httpd-nfs-selinux issue, and it would be _really_
useful to be able to execute commands in context httpd_t while trying out
combinations of the nfs_export_all_rw Boolean and public_content_rw_t
type.

If I can do

[root@kojihub ~]# runcon unconfined_u:unconfined_r:unconfined_t:s0 bash
[root@kojihub ~]# exit

why can't I do

[root@kojihub ~]# runcon unconfined_u:unconfined_r:httpd_t:s0 bash runcon:
invalid context: unconfined_u:unconfined_r:httpd_t:s0: Invalid argument

Because httpd_t is not allowed to run as the unconfined_r and bash is not an
entrypoint for the httpd_t domain.

You can write policy for this, but basically

SELinux expects the transitions to work like

unconfined_t @initrc_exec_t ->  initrc_t @ httpd_exec_t ->  httpd_t

You can do

runcon -t initrc_t -r system_r id -Z
staff_u:system_r:initrc_t:s0-s0:c0.c1023

But sadly

runcon -t initrc_t -r system_r runcon -t httpd_t id -Z
runcon: invalid context: staff_u:system_r:httpd_t:s0-s0:c0.c1023: Permission
denied

Still fails because of you are missing these rules

#============= httpd_t ==============
allow httpd_t bin_t:file entrypoint;


#============= initrc_t ==============
allow initrc_t self:process setexec;
You won't see this one if you don't disable unconfined module. So just try to execute the following

You can do the following

# cat /usr/bin/httpd.sh
#!/bin/sh
id -Z
chmod +x /usr/bin/httpd.sh
# chcon -t httpd_exec_t /usr/bin/httpd.sh
# runcon -t initrc_t -r system_r sh -c /bin/httpd.sh
# staff_u:system_r:httpd_t:s0-s0:c0.c1023




The actual issue is that I've set up a new koji hub with /mnt/koji on an
nfs mount; with SELinux in permissive mode I get

AVC Report ======================================================== # date
time comm subj syscall class permission obj event
======================================================== 1. 04/13/2012
14:23:36 httpd unconfined_u:system_r:httpd_t:s0 4 dir getattr
system_u:object_r:nfs_t:s0 denied 494 2. 04/13/2012 14:23:36 httpd
unconfined_u:system_r:httpd_t:s0 4 dir search system_u:object_r:nfs_t:s0
denied 493 3. 04/13/2012 14:23:36 httpd unconfined_u:system_r:httpd_t:s0 83
dir write system_u:object_r:nfs_t:s0 denied 495 4. 04/13/2012 14:23:36
httpd unconfined_u:system_r:httpd_t:s0 83 dir add_name
system_u:object_r:nfs_t:s0 denied 495 5. 04/13/2012 14:23:36 httpd
unconfined_u:system_r:httpd_t:s0 83 dir create
unconfined_u:object_r:nfs_t:s0 denied 495 6. 04/13/2012 14:23:36 httpd
unconfined_u:system_r:httpd_t:s0 2 file create
unconfined_u:object_r:nfs_t:s0 denied 496 7. 04/13/2012 14:23:36 httpd
unconfined_u:system_r:httpd_t:s0 2 file open system_u:object_r:nfs_t:s0
denied 496


Moray. "To err is human; to purr, feline."




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